Abstract
Polyacrylonitrile–Aluminium hydroxide [PAN–Al(OH)3] composite anion-exchanger was prepared by solid–gel method. The physicochemical properties of the anion exchanger was determined using Fourier transform spectroscopy (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD) and elemental analysis (CHNS/O) studies. The analytical applications of the anion exchanger have been explored by making AsO4-3 selective membrane electrode. Among different composition of membrane the composition of 5:1 (PAN:Al(OH)3) showed best results for water content, porosity, thickness and swelling. These studies showed that the ion selective membrane electrode was selective for AsO4-3 having detection limit (1×10−7–1×10−1M), response time (40s) and working pH range (5.0–9.0). The selectivity coefficients values for interfering ions indicate good selectivity for AsO4-3 over interfering anions. The results were also compared by PCA-Arsenomat (Arsenic analyzer).
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